1 blue delrin ball with large brass insert on rattan shaft. These fit nicely between K10 and K11 on the hardness scale.

1 light blue delrin ball with large brass insert on rattan shaft. Hardness Scale = 8

Rattan shaft 7.5mm thick ( + or due to natural taper of rattan ) and 13.5 long.

This has become a tweener model. It fits between K10 and K11 perfectly but was developed many years after. Not as bright as the K10 and not as mellow as K11, but at the same weight. A lot of punch and clarity to it and slightly less bright than the K15 model when played loud. A very unique character good for all glockenspiel parts, xylophone and crotales as well.